Surface Crack-Healing of Al2O3 Ceramic-Matrix Composites

Abstract

Abstract: The effects of different-temperature-heat treatment on crack healing and strength of TiC_P/Al₂O₃ and SiC_W-Al₂O₃ composites were studied systematically. The results show that when the
samples are heat-treated at 1000～1400℃, crack healing will happen and the strength will be improved largely. The diffusion and the chemical reactions are the main mechanism. The
microstructure and thermal physical properties of the surface reactional layer determine the range of strength improvement. Stress relaxation is
benificial for strength, but the oxidation-induced bubbles weaken the specimens.

Key words: SiC wisker, TiC particle, alumina, heat-treatment, crack-healing, flexural strength

CLC Number:

TQ174

LU Jun,ZHENG Zhi-Xiang,DING Hou-Fu,JIN Zhi-Hao. Surface Crack-Healing of Al₂O₃ Ceramic-Matrix Composites[J]. Journal of Inorganic Materials.

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Surface Crack-Healing of Al₂O₃ Ceramic-Matrix Composites

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